aman-satu-flutter/lib/views/work/tabs/buy/buy_edit.dart

import 'dart:developer';

import 'package:flutter/material.dart';
import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
import 'package:satu/core/models/but_item/buy_item_response.dart';
import 'package:satu/core/services/dialog_service.dart';
import 'package:satu/views/work/tabs/buy/component/product_buy_tile.dart';


import '../../../../core/entity/goods_entity.dart';
import '../../../../core/models/buy_invoice/buy_invoice_response.dart';
import '../../../../core/services/buy_service.dart';
import '../../../../core/services/dictionary_service.dart';
import '../../../../core/services/navigator_service.dart';
import '../../../../core/utils/locator.dart';
import '../../../../routes/route_names.dart';
import '../../../../shared/app_colors.dart';
import '../../../../shared/ui_helpers.dart';
import '../../../../widgets/bar/products_app_bar.dart';

class BuyEditView extends StatefulWidget {
  const BuyEditView({required this.invoice, Key? key}) : super(key: key);

  final BuyInvoiceResponse invoice;

  @override
  State<BuyEditView> createState() => _BuyEditViewState();
}

class _BuyEditViewState extends State<BuyEditView> {
  final BuyService _service = locator<BuyService>();
  final DialogService _dialogService = locator<DialogService>();

  static const _pageSize = 20;

  final PagingController<int, BuyItemResponse> _pagingController =
  PagingController(firstPageKey: 1);

  bool editable = false;


  @override
  void initState() {
    log('initState');
    _pagingController.addPageRequestListener((pageKey) {
      _fetchData(pageKey, _pageSize);
    });
    log('refBuyInvoiceStatusId: ${widget.invoice.refBuyInvoiceStatusId}');
    if(widget.invoice.refBuyInvoiceStatusId == 1){
      editable = true;
    }

    super.initState();
  }

  @override
  void dispose() {

    _pagingController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: const ProductsAppBar(
        title: 'Покупка',
      ),
      body: Column(
        children: [
          Expanded(
            child: PagedListView<int, BuyItemResponse>.separated(
              physics: const BouncingScrollPhysics(),
              separatorBuilder: (BuildContext context, int index) {
                return const Divider(
                  height: 1.0,
                  color: disableColor,
                );
              },
              pagingController: _pagingController,
              builderDelegate: PagedChildBuilderDelegate<BuyItemResponse>(
                itemBuilder: (BuildContext context, BuyItemResponse item,
                    int index) {
                  return ProductBuyTile(
                    key: ValueKey(item.id),
                    ean: '1234567890123',
                    name: 'Картофель',
                    price: item.price,
                    count: item.cnt,
                    categoryName: 'Овощи',
                    editable: editable,
                    invoiceId: widget.invoice.id,
                    id: item.id,
                    editData: (id, price, count) {
                      _editData(id, price, count);
                    },
                  );
                },
              ),
            ),
          )
        ],
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButton: editable ? floatingActionButtonRender() : null,
    );
  }

  /// render floating buttons
  Widget floatingActionButtonRender() {
    return Padding(
      padding: EdgeInsets.all(15),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        crossAxisAlignment: CrossAxisAlignment.end,
        children: <Widget>[
          Visibility(
              visible: false,
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: FloatingActionButton(
                  mini: true,
                  elevation: 2,
                  backgroundColor: successColor,
                  onPressed: () {},
                  child: Icon(
                    Icons.check,
                    color: whiteColor,
                    size: 35,
                  ),
                ),
              )),
          Column(
            mainAxisAlignment: MainAxisAlignment.end,
            children: [
              FloatingActionButton(
                elevation: 2,
                mini: true,
                onPressed: () async {
                  final Good? good = await locator<NavigatorService>()
                      .push(addProductViewRoute) as Good?;
                  if (good != null && good.id != null) {
                    bool result =
                    await _service.addItem(widget.invoice.id, good.id!);
                    if (result) {
                      _pagingController.refresh();
                    } else {
                      _dialogService.showDialog(
                        description:
                        'Товара отсутсвует в остатке или ранее не'
                            ' использователся в системе',
                      );
                    }
                  }
                },
                child: Icon(
                  Icons.add_rounded,
                  size: 40,
                  color: whiteColor,
                ),
              ),
              verticalSpaceSmall,
              FloatingActionButton(
                elevation: 2,
                mini: true,
                onPressed: () async {
                  final NavigatorService _nav = locator<NavigatorService>();
                  final dynamic result = await _nav.push(addByBarcodeViewRoute);
                  if (result != null) {
                    final List<Good> goods = await locator<DictionaryService>()
                        .getGoodsByNameOrEan(result as String);
                    if (goods.isNotEmpty) {}
                  }
                },
                child: Icon(Icons.qr_code_rounded, size: 30, color: whiteColor),
              ),
            ],
          )
        ],
      ),
    );
  }

  Future<void> _fetchData(int pageKey, int perPage) async {
    final List<BuyItemResponse> newItems = await _service
        .getItemList(widget.invoice.id, page: pageKey, perpage: perPage);
    final isLastPage = newItems.length < _pageSize;
    if (isLastPage) {
      _pagingController.appendLastPage(newItems);
    } else {
      final nextPageKey = pageKey + 1;
      _pagingController.appendPage(newItems, nextPageKey);
    }
  }

  void _editData(int id, double price, double count) {
    final List<BuyItemResponse> oldList =
        _pagingController.value.itemList ?? [];
    oldList..firstWhere((element) => element.id == id).price = price
      ..firstWhere((element) => element.id == id).cnt = count;
    setState(() {
      _pagingController.itemList = oldList;
    });
  }

}